Johan Santana will shortly undergo surgery to repair a torn "anterior capsule" in his pitching shoulder and will miss the final three miserable weeks of the season. The Mets expect him to resume throwing in the spring.
More on this as it rolls in.
Update: We have the Mets' official statement.
"An MRI at the Hospital for Special Surgery in Manhattan yesterday revealed that Mets pitcher Johan Santana has suffered a tear of the anterior capsule of the left shoulder. The injury is located on the front and bottom part of the shoulder close to the pectoral muscle, resulting in discomfort radiating through both the pectoral muscle and shoulder. Santana will undergo surgery in the near future and we anticipate he will be able to resume throwing in the spring."